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Investigation of photocatalytic performance of TiO2 network and fiber geometries

Koohestani, H ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1080/19443994.2015.1136965
  3. Publisher: Taylor and Francis Inc , 2016
  4. Abstract:
  5. In typical photocatalytic processes slurry reactors are used in which catalyst particles have to be separated from the solution after the process ends which means much higher time and costs. Hence, immobilizing process is carried out on the catalyst to overcome this problem. In this work, fiber and network geometries were produced by particle precipitation on substrates. The obtained structures were characterized by XRD, SEM, and Brunauer–Emmett–Teller analyses. Photocatalytic performance of the samples was investigated by methyl orange degradation and also by hydrogen generation from water/methanol splitting. From the SEM images, the size range of the TiO2 particles in the network geometries were 20–60 nm. The nanoparticles had covered the surface of the substrate uniformly. Removal of the cellulose substrate by heat treatment yielded hollow TiO2 fibers with diameters of 0.5–1 μm and lengths of 30 μm. The rate constant of the dye degradation reaction using powder catalyst was 0.0118 min−1. However, the rate constants for fiber and network geometries were 0.0057 and 0.0083 min−1 respectively. The amount of hydrogen generated from different catalysts was determined to be in the following order: powdery > network > fiber
  6. Keywords:
  7. Fiber geometry ; Hydrogen generation ; Methyl orange ; Network geometry ; Photocatalytic activity ; TiO2 ; Catalysis ; Catalyst ; Cellulose ; Chemical compound ; Dye ; Performance assessment ; Photochemistry ; Reaction kinetics ; Titanium
  8. Source: Desalination and Water Treatment ; Volume 57, Issue 50 , 2016 , Pages 23644-23650 ; 19443994 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/19443994.2015.1136965?journalCode=tdwt20